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장석진,윤영노,김정수,윤세의,Jang,Suk-Jin,Yoon,Young-Noh,Kim,Jung-Soo,Yoon,Sei-Eui 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
In storm sewer networks a lot of manholes are installed to maintain and connect a sewer of urban area. There are some shapes of manhole such as circular type, square type, and so on. Square shape manholes are installed to connect the large diameter drainage pipes in general and have lager head losses than circular one. Consequently, it is important to analyze the head losses in square manhole because the head losses in square manhole are much bigger than the friction losses in pipes. Hydraulic experimental apparatus which can be changed the inside shape in square manhole was installed for this study. The experimental discharge was <TEX>$16{\ell}/sec$</TEX>. The head loss coefficients in the manhole were calculated by the experimental results. The range of head loss coefficients in the general square manhole were from 0.33 to 0.48 and the range of head loss coefficients in the square manhole changed inside shape were from 0.23 to 0.28.